Submitted by Landhund t3_z1o0qe in askscience
ImMrSneezyAchoo t1_ixe9a3w wrote
Reply to comment by FourierXFM in How exactly is the "direction" of the flow of power measured in a alternating current system? by Landhund
Power does not alternate only for 3 phase power (the math works out to have a literal constant power). In a single phase application p(t)=v(t)I(t) definitely can be an alternating signal, of varying complexity as the current changes its phase wrt voltage
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